diff -Naur aklabeth-1.0.orig/src/sdw.hxx aklabeth-1.0/src/sdw.hxx
--- aklabeth-1.0.orig/src/sdw.hxx	2004-05-29 09:14:52.000000000 -0400
+++ aklabeth-1.0/src/sdw.hxx	2016-08-14 01:27:48.025900560 -0400
@@ -19,6 +19,7 @@
 
 #include <iostream>
 #include <string>
+#include <cstdlib>
 
 namespace SDLWrapper                            // It's all nicely in a namespace SDLWrapper
 {
